diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 4570c392e..fd7589e68 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -49,10 +49,9 @@ jobs:
 
   ci_test_single_header:
     runs-on: ubuntu-latest
+    container: ghcr.io/nlohmann/json-ci:v2.4.0
     steps:
       - uses: actions/checkout@v3
-      - name: Get latest CMake and ninja
-        uses: lukka/get-cmake@latest
       - name: Run CMake
         run: cmake -S . -B build -DJSON_CI=On
       - name: Build